Re: Primary/NST case coupling effects

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi,

At 05:15 PM 11/19/2003, you wrote:
>Does situating the earthed metallic case of a large NST below the primary of
>a TC have much of an effect on:
>
>1) Changing the resonant frequency of the primary

Large metal objects can affect the primary frequency.  But the frequency is 
not super critical.  Easy to tune out...


>2) Changing the coupling

Large metal objects can distort the magnetic fields.  But coupling is not 
critical.  You will not notice...


>3) Inducing eddy currents into the NST case

You bet!!  It depends on how close you get, but Eddy currents and case 
heating could start to rob the coil of power!


>4) Inducing RF into the NST windings?

Nope, the case shields the internals of the NST...

Worry about #3....

Cheers,

         Terry


>Just wondering.
>
>Tom L.